Looking for large silicon washer for shower trap

Murmansk

It's to fit between the trap and the grill that the water goes down in the shower tray.
The old one looks like it was made of soft silicon, it's 10cm in diameter with a 5cm hole and has lots of concentric grooves on either side
I've searched online and not come up with anything that looks like it so far, wondered if anyone could point me in the right direction.
Thanks

flashg67

any chance of a pic? Most shower traps that I've come across are 90mm internal diameter - 50mm sounds small for a shower waste

Murmansk

I can't supply a picture I'm afraid as it's at another house some distance away and I didn't take one but it does seem quite small. I've not seen any such items online so I may end up making one from a sheet of silicone 

grumbler

Murmansk said:

 I may end up making one from a sheet of silicone 

That's exactly what I wanted to suggest.

E.g.

southcoastrgi

Buy a new shower waste